JPS6220500Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a new synthetic resin surface drainage material for civil engineering, which is used for backfill drainage or back drainage of protective walls, tunnels, etc.

When constructing protective walls and tunnels, backfill drainage and rear drainage are essential civil engineering works in order to maintain strength. Drainage works of this type are usually constructed by attaching appropriate drainage materials to the back of the retaining wall and the back of the tunnel, but since the surrounding area is embanked or backfilled, this drainage Considerable earth pressure is applied to the material, and therefore, drainage materials used for such construction must have high earth pressure resistance in addition to efficient drainage.
Recently, drainage materials made of synthetic resin have become commercially available because they are lightweight and inexpensive, but they still have poor earth pressure resistance, so there is a problem that they are crushed by earth pressure, drastically reducing drainage efficiency. Civil engineering contractors have been eagerly awaiting the development of synthetic resin surface drainage materials for civil engineering that have high earth pressure strength and excellent drainage efficiency.

The present invention was developed in view of the above-mentioned circumstances, and provides a surface drainage material for civil engineering made of synthetic resin that has high earth pressure resistance and high drainage efficiency and is used for backfill drainage or back drainage of protective walls or tunnels, etc. There is something to do.

The embodiments of the present invention will be explained with reference to the drawings. Fig. 1 is a partial perspective view of a typical embodiment of the invention, Fig. 2 is a sectional view taken along the line of Fig. 1, and Fig. 3 is a - of Fig. 2.
FIG. 4 is a partial cross-sectional view taken along the + line in FIG. 2, and FIGS. 5A and 5B are partial vertical cross-sectional views showing how the drainage material of the invention is used. That is, the present invention fuses a large number of wavy warp yarns 2 of synthetic resin that are undulating and sliding to the outer periphery of a plurality of annular bodies 3 of synthetic resin, and connects the annular bodies 3 at intervals in the axial direction. The annular body 3 is surrounded by a drain pipe main body 1, and a plurality of the drain pipe main bodies 1 are arranged in parallel and a synthetic resin sheet or a mesh body 4 is used to form the drain pipe main body 1 in the adjacent relationship. ... are connected to each other at intervals at approximately the central portion of each, and a large number of warp threads 2' are arranged regularly or randomly in the air space between the drain pipe main body 1 ... and the sheet or mesh body 4 ... This surface drainage material for civil engineering is characterized in that the warp threads 2' are partially fused to the drain pipe body 1 and the sheet or net 4. The figure shows that three drainage pipe bodies 1 are connected to each other by synthetic resin sheets 4, and the overall shape of the drainage material 10 is thick and long pine. The warp threads 2 surrounding the annular body 3 and constituting the drain pipe main body 1 are wavy and are fused to the outer periphery of the annular body 3 almost regularly. The outer circumference of 1... and sheet 4...
The warp yarns 2' loaded into the air space formed by the upper and lower sides of the pipe are in point contact with each other so as to have regular or random gaps, and are partially in contact with the drain pipe main body 1 and the sheet 4. It is fused to. In such a drainage material 10, the warp threads 2..., 2'..., the annular body 3..., and the sheet 4... that constitute it are made of the same synthetic resin (for example, medium-low pressure polyethylene, etc.), and these are made at the same time. Therefore, the contact parts of the warp threads 2..., 2' are also fused to each other, and the drain pipe main body 1... is a porous structure having a clear drainage channel 11 inside. The drainage material 10 as a pine-like material has a thickness of about 5 to 10 cm and a width of 20 to 30 cm.
cm, and the length is usually about 4 m, but the length can be adjusted as appropriate depending on the conditions of use. Furthermore, all of these constituent members, which are molded bodies of synthetic resin, are low foam bodies with a foaming ratio of 1.5 to 3.0 times. This drainage material 10
For example, as shown in Figure 5 (a) and (b), the usage status in actual civil engineering construction is as follows: protection wall A or tunnel B
This pine-shaped drainage material is attached to the top and bottom along the backfill part A ₁ or back B ₁ , and drainage pipes A ₂ and B ₂ that communicate with the outside are installed at the lower end of the material, and then embankment or backfilling is performed. Then, the drainage material 10 is buried in the soil S. In this condition, water in the soil S penetrates from around the porous drainage material 10 into the voids formed by the warp threads 2... and the annular body 3... or between the warp threads 2'... and then the drain pipe body 1 It is poured into the drainage channel 11 of ... and discharged to the outside via the drainage pipes A ₂ and B ₂ .

In the above structure, the drainage material of the present invention connects the drain pipe main body 1, which is composed of the warp threads 2 and the annular body 3, with the three warp threads 2' and the sheet 4, which are intertwined like three non-woven fabrics. Because it is porous and pine-like,
In the soil S, the contact area with moisture is large and there are many voids scattered around the soil, so water absorption efficiency is extremely high. In addition to being substantially thick-walled drain pipes and having sufficient earth pressure resistance, three of them are connected to each other as described above, so when three such drain pipe bodies 1 are installed in parallel, The earth pressure resistance strength will be doubled compared to . On the other hand, this drainage material 1
Because it is made of synthetic resin and has the above structure, it has flexibility in the longitudinal direction, so it can be attached closely to the curved surface of the back of the tunnel as shown in Figure 5 (b). It also has a noteworthy effect. In addition, since it is made of synthetic resin, it is lightweight and inexpensive.

Although the figure shows three drain pipe bodies 1 connected in parallel, a drainage material composed of two or four drain pipe bodies 1 is also preferably employed. Considering the earth pressure resistance, drainage performance, and transportation workability, three is most appropriate. Further, the sheet 4 may be made of a net of the same quality, and these may be selected as appropriate. Furthermore, it is also effective in terms of reinforcement to bridge the annular bodies 3 with each other using several other warp threads on the inner surface of the drain pipe main body 1.

As mentioned above, the surface drainage material for civil engineering of this invention takes advantage of the characteristics of being made of synthetic resin and is inexpensive and lightweight, and has excellent drainage performance and earth pressure resistance, and also has flexibility, so it can be used for protection walls. It can be said to be an extremely useful drainage material for civil engineering construction in areas subject to earth pressure, such as tunnel backfill drainage and rear backwater works.

[Brief explanation of the drawing]

Fig. 1 is a partial perspective view of a typical embodiment of the present invention, Fig. 2 is a sectional view taken along the line - Fig. 1, Fig. 3 is a partial sectional view taken along the line - - of Fig. 2, and Fig. 4 is a sectional view taken along the line - Figures 5A and 5B are partial longitudinal sectional views showing how the drainage material of the present invention is used. Explanation of symbols: 1...Drain pipe main body, 2, 2'...Warp thread, 3...Annular body, 4...Sheet or mesh body.

Claims (1)

[Scope of utility model registration request] A large number of wavy warps made of synthetic resin are fused to the outer periphery of a plurality of annular bodies made of synthetic resin, and the annular bodies are connected at intervals in the axial direction, and the periphery of the annular bodies is surrounded. In addition to forming a drain pipe main body, a plurality of the drain pipe main bodies are arranged in parallel and the adjacent drain pipe main bodies are connected to each other at intervals using a synthetic resin sheet or a mesh body, and the drain pipe main body and the sheet or mesh body are connected to each other at intervals. A surface drainage material for civil engineering, characterized in that a large number of the above-mentioned warp threads are loaded in the air space of the above-mentioned space so as to have voids, and the warp threads are partially fused to the above-mentioned drain pipe main body and sheet or net body.